Question

Calculate the frequency and wave no of blue light radiation having wavelength 4800 A* .​

Answer 1

Answer:

λ=480nm=480×10

−9

m [∵1nm=10

−9

m]

c=3×10

8

m/sec

Frequency, v=

λ

c

=

480×10

−9

m

3×10

8

ms

−1

=6.25×10

14

s

−1

=6.25×10

14

Hz.

Answer 2

Answer:

Frequency =c/ Wavelength = (3 x10⁸)/4800 = 0.625x 10⁵

Wave number =Frequency/c = (0.625x 10⁵)/(3 x10⁸)= 0.21x 10-³